Electrophysiological evidence for direction-specific rotary evoked potentials in human subjects--a topographical study.
The spatio-temporal characteristics of rotary evoked potentials are unknown up to now. Transient motions with sinusoidal velocity profile (60 degrees , 47.12 degrees /s, 74.02 degrees /s2, duration 2 s) were alternately applied (rightward/leftward) to 12 healthy subjects. Fixation of a target-cross moving with them suppressed the vestibulo-ocular reflex. Quasi-DC-scalp potentials were recorded from a total of 21 equidistant (3 cm) locations (single sweep: 5 s, 0.016-100 Hz). Brain activity evoked by rotary stimulation is dominated by a late, long-lasting component within a mean peak latency of about 1800 ms after motion onset. Topographic distribution over both hemispheres specifically depends upon the direction of rotation and is mirror-symmetric with respect to the sagittal midline. The gradient of the potential field obtained shows its maximum along a lateral orientation corresponding to the temporo-parietal orientation of vestibular cortical projection areas.
Probst
T
T
Institute of Physiological Psychology II, Heinrich-Heine-University of Düsseldorf, Germany. thomas.probst@mail.psycho.rwth-aachen.de
Ayan
T
T
Loose
R
R
Skrandies
W
W
D000328:Adult; D001931:Brain Mapping; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D018475:Head-Down Tilt; D006801:Humans; D008297:Male; D010037:Otolithic Membrane / Q000502:physiology; D012399:Rotation; D012665:Semicircular Canals / Q000502:physiology; D014722:Vestibule, Labyrinth / Q000502:physiology*